Schema Markup Validator: Free Schema.org Syntax Checker
The Schema Markup Validator (validator.schema.org) is the free, official validator maintained by the schema.org community. It checks structured data syntax against the entire schema.org vocabulary, unlike Google's Rich Results Test which only covers Google-supported types. It is free with no account, but it checks correctness — not whether Google will show a rich result.
- Provider:
- Schema.org community
- Access:
- Free, no account
- Account:
- Not required
- Best for:
- Verifying schema.org syntax correctness in full
What is Schema Markup Validator?
The Schema Markup Validator is the successor to Google's Structured Data Testing Tool, now maintained for the schema.org community. Its job is narrower and deeper than Google's test: parse every structured-data block on a page — JSON-LD, Microdata, or RDFa — and report syntax errors against the complete vocabulary.
Use it when you implement types Google doesn't render as rich results (custom entities, niche types) or when Google's test passes but you suspect malformed nesting. For most publishers the workflow is: Schema validator for correctness, Rich Results Test for Google eligibility, Search Console for monitoring.
Main features
Full-vocabulary validation
Checks all schema.org types and properties, including ones Google doesn't use for rich results.
Three-format support
Validates JSON-LD, Microdata, and RDFa markup on the same page in one run.
URL or snippet input
Fetch a live page or paste markup directly for pre-publish checks.
Structured error reporting
Pinpoints invalid properties, wrong value types, and nesting mistakes with line-level detail.
Is Schema Markup Validator free?
Completely free with no account, no quotas, and no paid tier. It is a community-maintained utility, not a commercial product.
No account needed. Fetch by URL or paste a code snippet.
How to use Schema Markup Validator
Go to validator.schema.org and enter your page URL (or switch to the code-snippet tab).
Run validation and review each detected graph — expand nodes to see properties and values.
Fix syntax errors first: misspelled properties, values of the wrong type, and broken @id references.
For markup Google should render, re-check the same page in the Rich Results Test for eligibility.
Re-validate after theme, plugin, or template updates — auto-generated markup breaks silently.
Advantages and limitations
Where it shines
- Only validator covering the entire schema.org vocabulary.
- Catches syntax bugs Google's test doesn't report.
- Free, no account, works with snippets for pre-publish testing.
- Supports all three markup formats.
Where it falls short
- Syntax only — it can't tell you whether markup matches page content or is eligible for rich results.
- Interface is utilitarian compared with Google's guided test.
- One page at a time; no crawl or monitoring features.
- Doesn't advise which schema types to implement.
Best use cases
Developers
Validate hand-written JSON-LD templates for custom post types before they ship.
Store owners
Confirm Product/Offer markup parses cleanly even where Google shows warnings rather than errors.
Plugin users
Check what your SEO plugin actually outputs — then decide whether its markup needs supplementing.
Alternatives to Schema Markup Validator
Google's eligibility-focused counterpart — use both. Official site
Monitors structured-data health site-wide after validation. Official site
Extracts and audits structured data across crawled pages. Official site
Schema Markup Validator FAQ
Should I use this or Google's Rich Results Test?
What markup formats does it support?
Do I need an account?
Sources and official documentation
Official sources are listed separately from RankMeDaily's commentary above. Product details verified 2026-10-13; confirm current pricing and limits on the provider's site.
Put Schema Markup Validator insights into practice
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